However, even if the fuel is left for too long it changes into another form of oil that fetches a fairly high market price as a medicinal substance.

然而，即使是这些燃料被放置的时间久了后变成了另一种油，它们仍有很高的市场价值，可用于医药。

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For instance, sensors can ping restaurant managers with text messages if a walk-in refrigerator is left ajar for too long, or coordinate pizza-oven temperatures based on real-time sales.

例如，如果可供人出入的冷冻储藏室的门在很长时间内没有关上，感应器通过短信的方式告知餐厅经理，或者根据实时的销售量调节披萨烤箱的温度。

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That's what happens to ice cubes if you've left them too long in the freezer.

这发生在你将冰块留在冰箱里太久之后。

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Melanoma, because of its tendency to spread if left too long, may require extra treatment such as chemotherapy.

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If it delays action for too long, it runs the even-greater risk of being left behind by competitors that have succeeded in making the technology work to their advantage.

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